var keyCodeMap = {
  8: "Backspace",
  9: "Tab",
  13: "Enter",
  16: "Shift",
  17: "Ctrl",
  18: "Alt",
  19: "Pause",
  20: "Caps Lock",
  27: "Escape",
  32: "Space",
  33: "Page Up",
  34: "Page Down",
  35: "End",
  36: "Home",
  37: "Left",
  38: "Up",
  39: "Right",
  40: "Down",
  42: "Print Screen",
  45: "Insert",
  46: "Delete",

  48: "0",
  49: "1",
  50: "2",
  51: "3",
  52: "4",
  53: "5",
  54: "6",
  55: "7",
  56: "8",
  57: "9",

  65: "A",
  66: "B",
  67: "C",
  68: "D",
  69: "E",
  70: "F",
  71: "G",
  72: "H",
  73: "I",
  74: "J",
  75: "K",
  76: "L",
  77: "M",
  78: "N",
  79: "O",
  80: "P",
  81: "Q",
  82: "R",
  83: "S",
  84: "T",
  85: "U",
  86: "V",
  87: "W",
  88: "X",
  89: "Y",
  90: "Z",

  91: "Windows",
  93: "Right Click",

  96: "Numpad 0",
  97: "Numpad 1",
  98: "Numpad 2",
  99: "Numpad 3",
  100: "Numpad 4",
  101: "Numpad 5",
  102: "Numpad 6",
  103: "Numpad 7",
  104: "Numpad 8",
  105: "Numpad 9",
  106: "Numpad *",
  107: "Numpad +",
  109: "Numpad -",
  110: "Numpad .",
  111: "Numpad /",

  112: "F1",
  113: "F2",
  114: "F3",
  115: "F4",
  116: "F5",
  117: "F6",
  118: "F7",
  119: "F8",
  120: "F9",
  121: "F10",
  122: "F11",
  123: "F12",

  144: "Num Lock",
  145: "Scroll Lock",
  182: "My Computer",
  183: "My Calculator",
  186: ";",
  187: "=",
  188: ",",
  189: "-",
  190: ".",
  191: "/",
  192: "`",
  219: "[",
  220: "\\",
  221: "]",
  222: "'"
};
/**
 * @desc 根据keycode获得键名
 * @param  {Number} keycode
 * @return {String}
 */
function getKeyName(keycode) {
  if (keyCodeMap[keycode]) {
    return keyCodeMap[keycode];
  } else {
    console.log("Unknow Key(Key Code:" + keycode + ")");
    return "";
  }
}

module.exports = { getKeyName };
